CN102095965A - Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit - Google Patents
Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit Download PDFInfo
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- CN102095965A CN102095965A CN2009103115044A CN200910311504A CN102095965A CN 102095965 A CN102095965 A CN 102095965A CN 2009103115044 A CN2009103115044 A CN 2009103115044A CN 200910311504 A CN200910311504 A CN 200910311504A CN 102095965 A CN102095965 A CN 102095965A
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Abstract
The invention relates to a method for analyzing the wiring correctness of a CT (current transformer) of a two-winding conventional transformer multi-switch differential protection circuit, namely an analyzing method for analyzing and judging whether the wiring of the CT of the two-winding conventional transformer single-switch differential protection circuit in a power system is correct and determining the location and type of an error. The invention provides an electric power relaying conventional transformer differential protection circuit wiring analysis method with high judgment and analysis reliability, safe and simple use and easy operation, aiming at solving the problems that the traditional manual relaying protection circuit wiring error condition judging method is time-consuming and labor-consuming and the requirement to a worker is high.
Description
Technical field
The present invention relates to a kind of two many switches of winding conventional transformer differential protecting CT wiring correctness analytical approachs, whether promptly a kind of wiring to the current transformer CT of the differential protection circuit of the many switches of two winding conventional transformers in the electric system is correctly carried out analysis and judgement and is provided errors present and the analytical approach of type of error.
Background technology
The correct condition of the differential CT circuit connection of conventional transformer is: all windings satisfy the phase angle balance, promptly differ 120 ° between phase and phase; All winding phase sequences are identical and all be positive sequence, promptly are shown as A, B, C in vector plot clockwise successively; The polarity lead-out mode of each side CT is identical; The amplitude of each phase secondary current equates; The vector of mains side resultant vector and load side resultant vector and be zero (to be that amplitude equates, phase angle differs 180 °.The relay protection circuit wiring correctness of electric system is at present analyzed, and mainly will pass through a large amount of calculating by manually carrying out the Zhao staff, manual drawing current vector figure, and then draw the result of relay protection circuit wiring analysis according to result of calculation and vector plot.The The whole analytical process calculated amount is big, and needs the staff rule of thumb to judge, so there is the shortcoming that efficient is low, error is big.
When wiring error, correct vector and actual measurement vectorial inequality compared with the correct vector plot that the measurement loop analysis draws according to the phasor graph of actual measurement and can be judged the place of wiring error.
Three kinds of basic conditions are generally arranged under the situation of wiring error, and one for the polarity of certain phase connects instead, is connected into negative drawing as just drawing, and will cause 180 ° of the phase phasic differences of electric current like this; Two is wrong between certain two-phase, and to the B phase, the misconnection of B phase will cause the phase sequence mistake of electric current like this to the A phase as the misconnection of A phase; Three be the CT no-load voltage ratio of certain phase, certain two-phase or three-phase with wrong, thereby cause the vector of mains side and load side and non-vanishing, the spill current increase can cause differential protection malfunction.
The correctness of relay protection of power system CT circuit connection directly influences the normal operation of electric power system.The correctness of relay protection CT circuit connection is in time made analysis, judged; requisite important step during to be that transformer station is newly-built put into operation, overhaul; relay protection of power system CT circuit connection correctness is analyzed at present; main by manually carrying out Zhao especially main transformer, bus differential protecting CT loop; the staff will pass through a large amount of calculating; manual drawing current vector figure, and then draw the analysis result of relay protection CT circuit connection correctness according to result of calculation and vector plot.The The whole analytical process calculated amount is big, and needs the staff rule of thumb to judge, so there is the shortcoming that efficient is low, error is big.
Summary of the invention
The invention provides a kind of two many switches of winding conventional transformer differential protecting CT wiring correctness analytical approachs, each winding of two winding transformers all has a plurality of switches, may be that a certain winding has a plurality of switches, also may be that 2 windings all have a plurality of switches; For a winding 1 to 3 switch can be arranged, a plurality of switching voltage grades of a certain winding are identical, the CT no-load voltage ratio is identical, will carry out different processing to a plurality of switches of different windings in specific implementation process.
Technical solution of the present invention is:
This many switches of two windings conventional transformer differential protecting CT wiring correctness analytical approach, this method may further comprise the steps: draw correct vector relations according to the correct phasing degree that calculates; According to the situation that is subjected to of sending of instantaneous meritorious, capacity of idle power, all is to be that reference voltage calculates correct phasing degree automatically with Ua generally; According to obtaining correct instantaneous meritorious, idle in this loop and send, be subjected to situation from measuring methods such as loop or the calculating of bus electric quantity balancing; The judged result of single protection CT circuit connection correctness is exported at the phasing degree of this loop protection of actual measurement CT loop A, B, C phase; Carry out the judgement of the CT circuit connection correctness of each side of main transformer according to the method described above successively; After the judgement of the CT circuit connection correctness of finishing each side, adopt the simultaneously-measured method of each side homophase to judge the correctness of each side CT composite vector of conventional transformer differential protection; The facies analysis result is closed in output.
The above conventional transformer differential protecting CT loop measured value and parameter comprise: the mode of connection of the current effective value of each winding and phase place, conventional transformer, each winding CT no-load voltage ratio, each winding rated voltage, each winding be meritorious, idle to be sent and is subjected to electric situation, main electrical scheme situation, whether passes through secondary connection adjustment and the corresponding switch number of each winding;
The above is according to obtaining correct instantaneous meritorious, idle in this loop back calculating two many switches of the winding conventional transformer differential protection coefficients of balance that send, are subjected to situation to finish from measuring methods such as loop or the calculating of bus electric quantity balancing.
Advantage of the present invention is: each winding of two winding transformers all has a plurality of switches, may be that a certain winding has a plurality of switches, also may be that 2 windings all have a plurality of switches; For a winding 1 to 3 switch can be arranged.A plurality of switching voltage grades of a certain winding are identical, the CT no-load voltage ratio is identical.In specific implementation process, to carry out different processing to a plurality of switches of different windings.
Embodiment
This method may further comprise the steps:
According to obtaining correct instantaneous meritorious, idle in this loop and send, be subjected to situation from measuring methods such as loop or the calculating of bus electric quantity balancing; According to the situation that is subjected to of sending of instantaneous meritorious, capacity of idle power, all is to be that reference voltage calculates correct phasing degree automatically with Ua generally; Draw correct vector relations (generally being to reach positive sequence clockwise) according to the correct phasing degree that calculates; The phasing degree of this loop protection of actual measurement CT loop A, B, C phase; because there is error at the phasing degree of actual measurement with the phasing degree that calculates according to the measurement loop; so we consider that the phasing degree of real protection CT loop A, B, C phase will deduct according to measuring the phasing degree that the loop calculates, and judges the correctness of this protection CT circuit connection then.For example calculating the phasing degree from the measurement loop is 30 °, and the phasing degree that real protection CT loop records is 35 °, is 5 ° after subtract each other at two phasing degree so, and we think that the angle after subtracting each other at ± 30 ° all is and this equal angular.Also having a kind of situation to consider, is exactly that this needs the staff to be noted because measurement CT loop is opposite with the extension line polarity in protection CT loop, and two phasing degree will differ 180 ° so; Export the judged result of single protection CT circuit connection correctness; Carry out the judgement of the CT circuit connection correctness of each side of main transformer according to the method described above successively; Obtain conventional transformer differential protecting CT loop measured value and parameter: after the judgement of the CT circuit connection correctness of finishing each side, adopt the simultaneously-measured method of each side homophase to judge the correctness of each side CT composite vector of conventional transformer differential protection.The facies analysis result is closed in output.
This many switches of two windings conventional transformer differential protecting CT wiring correctness analytical approach draws correct vector relations according to the correct phasing degree that calculates; According to the situation that is subjected to of sending of instantaneous meritorious, capacity of idle power, all is to be that reference voltage calculates correct phasing degree automatically with Ua generally; According to obtaining correct instantaneous meritorious, idle in this loop and send, be subjected to situation from measuring methods such as loop or the calculating of bus electric quantity balancing; The judged result of single protection CT circuit connection correctness is exported at the phasing degree of this loop protection of actual measurement CT loop A, B, C phase; Carry out the judgement of the CT circuit connection correctness of each side of main transformer according to the method described above successively; After the judgement of the CT circuit connection correctness of finishing each side, adopt the simultaneously-measured method of each side homophase to judge the correctness of each side CT composite vector of conventional transformer differential protection; The facies analysis result is closed in output; Conventional transformer differential protecting CT loop measured value and parameter comprise: the mode of connection of the current effective value of each winding and phase place, conventional transformer, each winding CT no-load voltage ratio, each winding rated voltage, each winding be meritorious, idle to be sent and is subjected to electric situation, main electrical scheme situation, whether passes through secondary connection adjustment and the corresponding switch number of each winding; According to obtaining correct instantaneous meritorious, idle in this loop back calculating two many switches of the winding conventional transformer differential protection coefficients of balance that send, are subjected to situation to finish from measuring methods such as loop or the calculating of bus electric quantity balancing.
Claims (3)
1. many switches of winding conventional transformer differential protecting CT wiring correctness analytical approach, its special character is: this method may further comprise the steps:
Draw correct vector relations according to the correct phasing degree that calculates; According to the situation that is subjected to of sending of instantaneous meritorious, capacity of idle power, all is to be that reference voltage calculates correct phasing degree automatically with Ua generally; According to obtaining correct instantaneous meritorious, idle in this loop and send, be subjected to situation from measuring methods such as loop or the calculating of bus electric quantity balancing; The judged result of single protection CT circuit connection correctness is exported at the phasing degree of this loop protection of actual measurement CT loop A, B, C phase; Carry out the judgement of the CT circuit connection correctness of each side of main transformer according to the method described above successively; After the judgement of the CT circuit connection correctness of finishing each side, adopt the simultaneously-measured method of each side homophase to judge the correctness of each side CT composite vector of conventional transformer differential protection; The facies analysis result is closed in output.
2. two many switches of winding conventional transformer differential protecting CT wiring correctness analytical approachs according to claim 1, it is characterized in that: conventional transformer differential protecting CT loop measured value and parameter comprise: the mode of connection of the current effective value of each winding and phase place, conventional transformer, each winding CT no-load voltage ratio, each winding rated voltage, each winding be meritorious, idle to be sent and is subjected to electric situation, main electrical scheme situation, whether passes through secondary connection adjustment and the corresponding switch number of each winding;
3. two many switches of winding conventional transformer differential protecting CT wiring correctness analytical approachs according to claim 1 is characterized in that: described basis obtains correct instantaneous meritorious, idle in this loop back calculating two many switches of the winding conventional transformer differential protection coefficients of balance that send, are subjected to situation to finish from measuring methods such as loop or the calculating of bus electric quantity balancing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115044A CN102095965A (en) | 2009-12-15 | 2009-12-15 | Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115044A CN102095965A (en) | 2009-12-15 | 2009-12-15 | Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102095965A true CN102095965A (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103115044A Withdrawn CN102095965A (en) | 2009-12-15 | 2009-12-15 | Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit |
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| CN (1) | CN102095965A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410043A (en) * | 2014-11-30 | 2015-03-11 | 国家电网公司 | Method for improving sensitivity of transformer differential protection |
| CN106226612A (en) * | 2016-07-04 | 2016-12-14 | 国家电网公司 | Secondary wiring of current mutual inductor method for diagnosing faults based on pincerlike phase meter |
| CN113325337A (en) * | 2021-04-14 | 2021-08-31 | 深圳市盛弘电气股份有限公司 | Source-side current transformer wiring detection method and system and current management equipment |
-
2009
- 2009-12-15 CN CN2009103115044A patent/CN102095965A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410043A (en) * | 2014-11-30 | 2015-03-11 | 国家电网公司 | Method for improving sensitivity of transformer differential protection |
| CN104410043B (en) * | 2014-11-30 | 2017-06-27 | 国家电网公司 | A kind of method for improving transformer differential protection sensitivity |
| CN106226612A (en) * | 2016-07-04 | 2016-12-14 | 国家电网公司 | Secondary wiring of current mutual inductor method for diagnosing faults based on pincerlike phase meter |
| CN106226612B (en) * | 2016-07-04 | 2019-04-26 | 国家电网有限公司 | Secondary wiring of current mutual inductor method for diagnosing faults based on pincerlike phase meter |
| CN113325337A (en) * | 2021-04-14 | 2021-08-31 | 深圳市盛弘电气股份有限公司 | Source-side current transformer wiring detection method and system and current management equipment |
| CN113325337B (en) * | 2021-04-14 | 2022-12-27 | 深圳市盛弘电气股份有限公司 | Source-side current transformer wiring detection method and system and current management equipment |
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Open date: 20110615 |